EP3275656B1 - Plate cylinder and method of attaching and detaching a printing plate - Google Patents

Plate cylinder and method of attaching and detaching a printing plate Download PDF

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Publication number
EP3275656B1
EP3275656B1 EP16768263.2A EP16768263A EP3275656B1 EP 3275656 B1 EP3275656 B1 EP 3275656B1 EP 16768263 A EP16768263 A EP 16768263A EP 3275656 B1 EP3275656 B1 EP 3275656B1
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EP
European Patent Office
Prior art keywords
plate
plate cylinder
printing plate
cylinder
fixing member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16768263.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3275656A4 (en
EP3275656A1 (en
Inventor
Tomohiro Oku
Toshihiko Onishi
Toru Kitagawa
Hitoshi Tojima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Altemira Co Ltd
Original Assignee
Showa Aluminum Can Corp
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Filing date
Publication date
Application filed by Showa Aluminum Can Corp filed Critical Showa Aluminum Can Corp
Publication of EP3275656A1 publication Critical patent/EP3275656A1/en
Publication of EP3275656A4 publication Critical patent/EP3275656A4/en
Application granted granted Critical
Publication of EP3275656B1 publication Critical patent/EP3275656B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F13/00Common details of rotary presses or machines
    • B41F13/08Cylinders
    • B41F13/10Forme cylinders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/005Attaching and registering printing formes to supports
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/06Devices for attaching printing elements or formes to supports for attaching printing elements to forme cylinders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/10Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/10Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
    • B41F27/105Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders for attaching cylindrical printing formes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/12Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1206Feeding to or removing from the forme cylinder
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/12Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1212Devices for attaching printing elements or formes to supports for attaching flexible printing formes using pneumatic force
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F17/00Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/08Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces
    • B41F17/14Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length
    • B41F17/20Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length on articles of uniform cross-section, e.g. pencils, rulers, resistors
    • B41F17/22Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length on articles of uniform cross-section, e.g. pencils, rulers, resistors by rolling contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/20Means enabling or facilitating exchange of tubular printing or impression members, e.g. printing sleeves, blankets
    • B41P2227/21Means facilitating exchange of sleeves mounted on cylinders without removing the cylinder from the press

Definitions

  • the present invention relates to a plate cylinder for mounting a printing plate used for printing on a metallic can, particularly an aluminum or aluminum alloy can.
  • a plate mounting device equipped with a plate cylinder is known.
  • the plate cylinder is formed in a cylindrical shape and mounted on a plate driving shaft in a fixed manner.
  • the plate cylinder is configured to mount a cylindrically formed printing plate from the tip end side of the plate cylinder on an outer peripheral surface thereof.
  • Patent Document 1 discloses a plate cylinder.
  • the plate cylinder is equipped with a recess and a plate fixing member.
  • the recess is formed in an elongated rectangular shape extending in the axial direction over the large part of the axial length of the plate cylinder and has a rectangular cross-sectional shape.
  • the plate fixing member is configured to push a non-plate portion of a plate mounted on a plate cylinder portion from a radially inner side toward a radially outer side to thereby closely fix the plate to a plate mounting surface of the plate cylinder portion.
  • the plate fixing member is configured to be fitted in the recess substantially with no gap in the circumferential direction and the axial direction thereof so as to move in a radial direction of the plate cylinder along both circumferential side walls and both axial end walls of the recess.
  • a known plate cylinder is disclosed, e.g, in DE 27 40 634 A1 .
  • the plate cylinder shown in FIG. 7 to FIG. 9 of DE 27 40 634 A1 has a structure in which a ring 128 made of an elastic material is fitted in the groove 132 formed on the outer peripheral surface and the ring 128 is expanded radially outwards by applying an air pressure from the inner side of the ring.
  • the printing plate 104 mounted on the plate cylinder is fixed by being pressed from the inner side by the expanded ring 128.
  • FIG. 4 917 013 A Another known plate cylinder is disclosed in US 4 917 013 A .
  • a plurality of flexible diaphragms 22 having elasticity is arranged on the outer peripheral surface, and each diaphragm 22 is expanded radially outwards by a pressurized fluid fed to the channel 18 from the supply conduit 26 via the port 18.
  • the printing sleeve mounted on the plate cylinder is fixed to the plate cylinder by the expanded diaphragm 22.
  • EP 1 634 703 A2 discloses a supporting shaft with expandable elements.
  • the plurality of expandable elements 4 is arranged on the outer peripheral surface of the tubular member 2.
  • the expandable element 4 is movable radially inwards and outwards by the slide of the connecting rod 212 switched between the posture ( FIG. 5 ) in which the expandable element is moved radially outwards and is in contact with the outer peripheral surface of the tubular element and the expanded posture ( FIG. 7 ) in which the expandable element is moved radially outwards and is detached from the outer peripheral surface.
  • the inner surface of the printing plate 50 mounted on the support shaft 1 is pressed against the expandable element 4 in the expanded posture to be fixed.
  • WO 2012/046618 A1 discloses a plate cylinder according to the preamble of claim 1.
  • WO 2012/046618 A1 discloses a plate attachment device and a method for attaching/removing printing plates, the plate attachment device having a plate cylinder secured to the outer periphery of a plate drive shaft and having a cylindrical plate attachment surface to which a printing plate is to be attached from the tip end side of the plate drive shaft, the plate attachment surface having a plurality of plate securing members which are formed to be movable to both the outer side and inner side in the radial direction of the plate cylinder, to abut the printing plate attached to the plate attachment surface, and to expand in the radial direction so as to adhere and secure the printing plate to the plate attachment surface.
  • Patent Document 1 Japanese Unexamined Laid-open Patent Application Publication No. 2010-42531
  • the present invention aims to provide a plate cylinder capable of easily mounting a printing plate thereon and improved in strength.
  • the present invention provides a plate cylinder according to claim 1 and a method according to claim 4. Further advantageous embodiments are described in the dependent claims.
  • the plate fixing member is configured such that an outer peripheral surface of the plate fixing member is movable within a range inner than an inner surface of the printing plate mounted on the plate mounting surface. Therefore, by eliminating the fact of pressing the printing plate outer than the inner surface of the printing plate mounted on the plate mounting surface with the plate fixing member, the possibility of deformation of the printing plate can be eliminated.
  • an inner portion of the plate cylinder is formed in a hollow shape. Therefore, the weight of the plate cylinder can be reduced.
  • the plate cylinder main body is provided with an air ejection hole at a position away from an axial tip end side by 20 mm to 50 mm, and a surface roughness Ra of the plate cylinder main body is set to 0.025 ⁇ m to 0.5 ⁇ m.
  • the plate cylinder main body has an appropriate surface roughness and the air ejection hole is formed in the axial tip end side of the plate cylinder main body, which is an insertion side for inserting the printing plate, i.e., the air ejection hole is formed at a position where the printing plate can be easily inserted.
  • an air layer can be formed between the plate cylinder main body and the printing plate by ejecting air through the air ejection hole, enhancing the slippage of the printing plate to be inserted or removed, which in turn can facilitate the attaching and detaching operation.
  • the plate fixing member is configured to be fixable at an arbitrary position within said range inner than said inner surface of the cylindrical printing plate mounted on the plate mounting surface. Therefore, the fixing position of the plate fixing member can be adjusted, which enables to perform the attaching and detaching operation of the printing plate in a state in which the plate fixing member is fixed at an arbitrary position.
  • a plurality of the air ejection holes is formed in said axial tip end side of the plate cylinder main body along a circumferential direction thereof.
  • a plurality of air ejection holes is provided on the axial tip end side of the plate cylinder main body, which is an insertion side of the printing plate. This further enhances the slippage of the printing plate to be inserted or removed by the air ejected from the plurality of positions at the time of attaching and detaching the printing plate, which in turn can facilitate the attaching and detaching operation of the printing plate.
  • the step of attaching and detaching the printing plate with respect to the plate cylinder is performed while ejecting air through the air ejection hole of the plate cylinder. Therefore, the air ejected from the air ejection hole is interposed between the outer peripheral surface of the plate cylinder and the inner peripheral surface of the printing plate, which can facilitate the detaching and attaching operation of the printing plate.
  • Fig. 1 is an overall perspective view of a plate cylinder 1.
  • Fig. 2 is an explanatory view for explaining the plate cylinder 1 and a printing plate 2.
  • Fig. 3 shows a front view and cross-sectional views for explaining the plate cylinder 1.
  • Fig. 4 is an explanatory view for explaining the plate cylinder 1.
  • Fig. 5 is a front view and a cross-sectional view for explaining the behavior of a plate fixing member 15 of the plate cylinder 1.
  • Fig 6 shows longitudinal cross-sectional views for explaining the behavior of the plate fixing member 15 of the plate cylinder 1.
  • Fig. 7 shows detailed views for explaining the behavior of the plate fixing member 15 of the plate cylinder 1.
  • a plate mounting device equipped with a plate cylinder 1 on which a cylindrical printing plate 2 is to be mounted for printing on a metal can will be described.
  • the plate mounting device is commonly equipped in a printing device used for printing on a print object and an engraving machine used for engraving a printing pattern on a printing plate 2 used for a printing device.
  • a cylindrically formed printing plate 2, particularly a printing plate 2 having a small diameter, is used as the printing plate 2 to be mounted on the plate cylinder 1.
  • the substrate to be printed is a metal can for beverages.
  • a bottomed cylindrical metal can for beverages formed by subjecting an aluminum or aluminum alloy flat plate to drawing and ironing (DI) is suitably used for the substrate to be printed.
  • the plate mounting device includes a plate driving shaft 100 provided so as to protrude forward from the machine frame of the printing device and a plate cylinder 1 fixed to the outer peripheral surface of the plate driving shaft 100.
  • the plate driving shaft 100 is rotatably supported, on the base end portion side, by a machine frame of the printing device and is rotated at a predetermined speed in a predetermined direction by a known driving means.
  • the left side of the plate cylinder 1 in the axial direction of the plate driving shaft 100 shown in Fig. 1 is defined as a front or a tip end
  • the right side in the axial direction of the plate driving shaft 100 is defined as a rear or a rear end.
  • the left and right are defined as left and right, respectively
  • the top and bottom are defined as top and bottom, respectively.
  • the plate cylinder 1 is fitted on the plate driving shaft 100 from the tip end portion side thereof and fixed to its outer peripheral surface.
  • the plate cylinder 1 is formed in a cylindrical shape, and an insertion hole 121 through which the plate driving shaft 100 is inserted is provided at the center of the cylindrical shape.
  • a cylindrical plate mounting surface 111 concentric with the plate driving shaft 100 is formed, and a cylindrically formed printing plate 2 is to be detachably attached to the plate mounting surface 111.
  • the inside of the plate cylinder 1 is removed to form a hollow space for the purpose of weight reduction with the exception of the portion forming the insertion hole 121.
  • the plate cylinder 1 is equipped with a plate cylinder main body 11 in which a plate mounting surface 111 is formed on the outer periphery and a lid portion 12 covering the front of the plate cylinder 1.
  • the plate cylinder 1 is fixed to the plate driving shaft 100 in a state in which the plate driving shaft 100 is fitted in the insertion hole 121 and rotates integrally with the plate driving shaft 100.
  • the surface roughness of the plate mounting surface 111 maintains a static friction of about Ra 1 ⁇ m or less.
  • the plate mounting surface 111 it is preferable to subject the plate mounting surface 111 to hard chrome coating (plating) .
  • the surface roughness of the plate mounting surface 111 is as small as possible because the frictional resistance at the time of mounting the printing plate 2 becomes large when the surface roughness value is large. However, when it is too small, the processing cost of the plate cylinder 1 increases. Therefore, according to the invention the surface roughness is set to Ra 0.025 ⁇ m to 0.5 ⁇ m, more preferably Ra 0.05 to 0.2 ⁇ m.
  • the plate cylinder main body 11 is equipped with air ejection holes 18 at positions away from the tip end side by 20 mm to 50 mm.
  • the surface roughness Ra is set to 0.025 ⁇ m to 0.5 ⁇ m.
  • the plate cylinder main body 11 has an appropriate surface roughness.
  • the air ejection holes 18 are provided on the tip end side of the plate cylinder main body 11, which is the side from which the printing plate 2 is inserted. This means, that the air ejection holes 18 are formed at the positions where the printing plate 2 can be easily inserted.
  • an air layer can be formed between the plate cylinder main body 11 and the printing plate 2, enhancing the slippage of the printing plate 2 to be inserted or removed, which in turn can facilitate the attaching and detaching operation of the printing plate 2.
  • a flat portion 13 forming a flat surface formed by removing a part of the cylindrical portion is served as a plate fixing member mounting surface (see Fig. 1 ) .
  • a portion of the outer periphery of the cylindrical portion except for the flat portion 13 is served as the plate mounting surface 111 on which the printing plate 2 is to be mounted.
  • the thickness dimension of the flat portion 13 is formed by cutting a part of the outer peripheral surface of the plate cylinder main body 11, the thickness dimension of the flat portion 13 is set to be smaller than the thickness dimension of the plate cylinder 1 at the part where the plate mounting surface 111 is provided.
  • the flat portion 13 is configured to be positioned radially inward of the cylindrical surface including the plate mounting surface 111. As detailed later, in order to closely fix the printing plate 2 to the plate mounting surface 111, the flat portion 13 is provided with a substantially rectangular plate fixing member 15 configured to be movable radially inward and outward of the outer peripheral surface of the plate cylinder 1.
  • the outer diameter of the plate mounting surface 111 is set to a dimension approximately equal to the inner diameter of the printing plate 2, but since the plate cylinder 1 has the flat portion 13, the total peripheral length of the plate mounting surface 111 and the flat portion 13 becomes shorter than the circumferential length of the cylindrical surface formed by the plate mounting surface 111 of the plate cylinder 1.
  • the circumferential length of the inner peripheral surface of the printing plate 2 is set to be slightly larger than the total circumferential length of the plate mounting surface 111 and the flat portion 13 of the plate cylinder 1 and slightly smaller than the circumferential length of the cylindrical surface formed by the plate mounting surface 111 of the plate cylinder 1.
  • hole portions 14 each formed in a substantially rectangular shape having the same shape as the plate fixing member 15 are formed side by side in the axial direction of the plate cylinder 1.
  • a positioning protrusion 17 for positioning the printing plate 2 in the circumferential direction is provided.
  • the positioning protrusion 17, for example, slightly protrudes radially outward of the plate cylinder 1, and is formed as a protrusion having a substantially circular shape in planar view.
  • the positioning protrusion 17 is configured such that, when the printing plate 2 is fitted from the tip end side of the plate cylinder 1, a positioning notch 24 provided on the rear end portion side of the printing plate 2 is engaged with the positioning protrusion 17 of the plate cylinder 1.
  • the printing plate 2 can be accurately and easily attached to a predetermined position of the plate cylinder 1.
  • the printing plate 2 to be mounted on the plate cylinder 1 is provided with a plate body 21 formed in a cylindrical shape by an elastic material and a plate portion 22 formed on a part of the outer periphery of the plate body 21.
  • the plate body 21 is formed into a printing plate 2 by rolling an elastic material sheet into a cylindrical shape and joining both overlapped end portions together.
  • joining by welding is most preferable, but the method is not particularly limited as long as an adhesion method not causing easy detachment is used.
  • the plate portion 22 is provided at a predetermined position on the outer peripheral surface of the plate body 21 except for the joint portion 23, and is formed on the outer surface portion of the plate body 21 which comes into close contact with the plate mounting surface 111 when the printing plate 2 is mounted on the plate cylinder 1.
  • only one plate portion 22 is provided on the outer peripheral surface of the plate body 21.
  • an elastic material sheet of a rectangular shape made of, e.g., an appropriate magnetic or non-magnetic metal is adopted.
  • a commercially available tinplate (Fe) can be adopted.
  • the thickness of the sheet may be enough to have a degree that it can form a cylindrical shape and maintain the cylindrical shape by elasticity. In this example, it is about 0.26 mm.
  • a resin layer to be served as the plate portion 22 is formed on one surface of the plate body 21, a resin layer to be served as the plate portion 22 is formed.
  • a resin layer for example, a polyvinyl alcohol based resin, a vinyl ester based resin or a polyamide based resin can be adopted.
  • a resin having a Shore D hardness of about D20 to 80 after curing is suitably adapted.
  • UV curable resin ultraviolet curable resin
  • a normal offset printing it is not necessary to perform a complicated cleaning operation with a solvent or high pressure steam required for other curable resins, and the cleaning operation can be easily performed generally with water washing.
  • the thickness of the resin layer may be any thickness as long as it is a thickness required for the printing plate portion 22.
  • a layer having a thickness of 0.4 mm to 0.6 mm is bonded to one surface of an elastic material sheet.
  • the cylindrically formed printing plate 2 is fitted on the plate cylinder 1 from the tip end side and mounted on the plate mounting surface 111 which is the outer peripheral surface of the plate cylinder 1.
  • the plate portion 22 of the printing plate 2 is formed on the outer surface portion of the plate body 21 which comes into close contact with the plate mounting surface 111 when the printing plate 2 is mounted on the plate cylinder 1.
  • the axial length of the formed printing plate 2 is set to be shorter than the axial length of the plate cylinder 1.
  • a positioning notch 24 is formed at one longitudinal end portion, specifically, a portion corresponding to the lower end portion on the rear end side when attached to the plate mounting surface 111 of the plate cylinder 1.
  • the positioning notch 24 is configured by a notch extending in the axial direction of the printing plate 2 so as to be engaged with the positioning protrusion 17 of the plate cylinder 1.
  • the deep end portion (concave portion) of the positioning notch 24 is formed in a circular arc shape having a curvature that coincides with the outer peripheral shape of the circumferential direction positioning protrusion 17.
  • the end portion of the positioning notch 24 comes into contact with the outer peripheral surface of the positioning protrusion 17. This enables the positioning of the printing plate 2 in the circumferential direction and the axial direction of the plate cylinder 1.
  • the printing plate 2 positioned with respect to the plate cylinder 1 in the circumferential direction and in the axial direction of the plate cylinder 1 is fixed in position by the plate fixing member 15 of the plate cylinder 1 in order to prevent displacement of the printing plate 2 caused by the rotating operation of the plate cylinder 1.
  • Each of the hole portions 14 formed in the flat portion 13 of the plate cylinder 1 is a hole penetrating the flat portion 13, and, for example, each formed to have a rectangular shape in planar view.
  • a plurality of hole portions 14 is formed side by side in the axial direction of the plate cylinder 1 and arranged separated.
  • two hole portions 14 are formed side by side in a line in the axial direction of the plate cylinder 1.
  • the thickness dimension of the flat portion 13 is set to be thinner than the other thickness dimensions of the plate cylinder 1, it is more important to secure the strength of the flat portion 13 in the vicinity of where the hole portions 14 are provided.
  • a connection portion is formed between the adjacent hole portions 14, i.e., a portion continuous with the flat portion 13 is formed. As a result, this portion can secure the strength of the portion in the vicinity of where the hole portions 14 are provided.
  • the hole portion 14 is set approximately equal to the dimension of the plate fixing member 15.
  • the hole portion 14 is configured such that the plate fixing member 15 is fitted so as to be movable in the radial direction of the plate cylinder 1 in the hole portion 14.
  • each hole portion 14 are slightly larger than the respective dimensions of the plate fixing member 15, and set to the dimensions that the plate fixing member 15 fitted in the hole portion 14 can move up and down freely in the hole portion 14.
  • the hole portion 14 is provided with an engaging groove 141 extending in the axial direction on the rear side, i.e., the inner surface of the plate cylinder 1.
  • the engaging groove 141 is provided as a removal prevention mechanism when the plate fixing member 15 is moved radially outward of the plate cylinder 1, and is configured such that an engaging stepped portion 153 of a plate fixing member 15 to be described later is engaged with the engaging groove 141.
  • the plate fixing member 15 as shown in the figures, is formed in an approximately rectangular shape elongated in the axial direction of the plate cylinder 1, and a plurality of the plate fixing members 15 is provided in the flat portion 13 concentrically with the plate cylinder 1.
  • two plate fixing members 15 are provided side by side in a line in the axial direction with a distance.
  • the plate fixing member 15 is configured such that it is fitted in the hole portion 14 from the inner side of the plate cylinder 1 and the radially outward end face of the plate fixing member 15 comes into contact with the inner periphery surface of the printing plate 2 when the plate fixing member is moved radially outward of the plate cylinder 1.
  • the radially outward end face of the plate fixing member 15 which comes into contact with the inner peripheral surface of the printing plate 2 will be referred to as a plate contact surface 152.
  • the plate contact surface 152 is formed with a cylindrical surface having the same curvature or the same degree of curvature as the plate mounting surface 111, and configured such that the plate contact surface 152 does not go beyond the position P of the cylindrical surface formed by the plate mounting surface 111 (the broken line portion as shown in Fig. 7 ) when most moved radially outward of the plate cylinder 1.
  • the plate contact surface 152 is preferably formed with a cylindrical surface of the same curvature or the same degree of curvature as the plate mounting surface 111 since there is no possibility of deformation of the printing plate 2 when, for example, the plate contact surface 152 comes into contact with the inner peripheral surface of the printing plate 2.
  • the plate contact surface may be formed into a plane parallel to the flat portion 13.
  • the inner side of the plate fixing member 15 is hollowed out into a hollow shape for weight reduction.
  • a dent 151 is formed at the center of the plate contact surface 152 of the plate fixing member 15, further contributing to the weight reduction.
  • the inner portion of the plate cylinder 1 is formed in a hollow shape. Therefore, it is possible to reduce the weight of the plate cylinder 1, and even when the thickness of the plate cylinder 1 is set to be thin, the strength of the plate cylinder 1 will not be impaired.
  • the plate fixing member 15 is provided with engaging stepped portions 153 formed so as to protrude outwards at the lower portions of both longitudinal side surfaces.
  • the engaging stepped portion 153 is formed to prevent the plate fixing member 15 from being pulled out of the plate cylinder 1 radially outwards when the plate fixing member 15 is moved in the hole portion 14.
  • the engaging stepped portion 153 is configured such that the stepped portion upper face 153a of the engaging stepped portion 153 is engaged with an engaging groove 141 formed on the inner surface of the flat surface of the plate cylinder 1 to serve as a stopper portion of the plate fixing member 15.
  • the engaging stepped portion 153 is formed in a rectangular shape at portions of the lower portion of both longitudinal side surfaces of the plate fixing member 15, and front side and rear side portions.
  • the respective engaging stepped portions 153 are integrally provided.
  • the plate fixing member 15 is provided with a cam contact groove 154 which is a groove of a U-shaped cross-sectional shape formed by cutting out a part of the bottom portion of the lateral side surface except for the longitudinal side surface.
  • the plate fixing member 15 is configured to push a part of the printing plate 2 mounted on the plate cylinder 1 from the radially inner side to the radially outer side within the range inner than the cylindrical surface formed by the outer surface including the plate portion 22 of the printing plate 2 and to expand its diameter.
  • an operation portion 16 for adjusting the protrusion amount of the plate fixing member 15 is provided on the front side of the lid portion 12.
  • the operation portion 16 equipped with a lock portion 162 provided on the front of the lid portion 12, a spacer 163 provided between the lock portion 162 and the lid portion 12, and a rotating shaft 164 inserted in a circular hole formed at the center portion of the lock portion 162 and the spacer 163 and attached in a fixed manner.
  • the lock portion 162 is made of a plate member having an appropriate thickness and provided with an operation permission hole 162a which is a hole penetrating in the thickness direction.
  • the operation permission hole 162a is provided on the outer periphery of the rotating shaft 164 and formed as an elongated hole along a part of the outer peripheral circle of the lock portion 162.
  • the operation permission hole 162a is set to be positioned in a lower position (see Fig. 6 ) when the plate fixing member 15 is set to the lowest position.
  • a fixing member 162b composed of a member such as a lock bolt and a cap screw having one end fixed to the lid portion 12 is loosely fitted.
  • the fixing member is provided so that the other end of the fixing member 162b protrudes forward of the lock portion 162.
  • the lock portion 162 is restricted in its rotation by the operation permission hole 162a and the fixing member 162b.
  • the lock portion is configured to be rotatable within the range of about 180°.
  • the lock portion 162 is configured to rotate within the range of the operation permission hole 162a in accordance with the rotating operation of the rotating shaft 164.
  • the lid portion 12 and the spacer 163 are configured such that the rotating shaft 164 is inserted via a bearing member, and that the lid portion 12 and the spacer 163 do not move regardless of the rotating operation of the rotating shaft 164.
  • the spacer 163 is formed in, for example, a shape in which a part of the outer periphery of a perfect circle is cut out in a front view, and is fixedly attached to the lid portion 12.
  • the rotating shaft 164 extending in the axial direction of the plate cylinder 1 and configured to be rotatable is provided.
  • the plate fixing member 15 is configured to be movable radially inward and outward of the plate cylinder 1 in accordance with the rotating operation of the rotating shaft 164.
  • the rotating shaft 164 is configured such that the rotating shaft 164 is provided so as to extend in the axial direction of the plate cylinder 1 and that the rear end side of the rotating shaft 164 is rotatably supported on the rear end side of the plate cylinder 1 and the tip end side of the rotating shaft 164 protrudes from the lid portion 12 of the plate cylinder 1.
  • the tip end portion of the rotating shaft 164 protruding forward of the lid portion 12 is gripped by hand and serves as a gripping portion 161 for rotatably operating the rotating shaft 164.
  • the illustrated gripping portion 161 is a rectangular shaft extending in the axial direction of the plate cylinder 1, it may be, for example, a shaft formed in a cylindrical shape.
  • the shape is not particularly limited as long as it does not interfere with the operation of the operation portion 16.
  • the rotating shaft 164 is provided with a plurality of eccentric cams 165 fixed on the outer peripheral surface at predetermined intervals in the axial direction.
  • the eccentric cam 165 is a cylindrical member formed in a perfect circular shape and having a moderate thickness along the axial direction of the plate cylinder 1, and is provided at a position slightly eccentrically-located from the center position of the rotating shaft 164.
  • the eccentric cam 165 is arranged under the cam contact groove 154 on the lower side of the plate fixing member 15 and is arranged on the rotating shaft 164 so that a part of the eccentric cam 165, in this example the upper end of the eccentric cam 165, is in contact with the cam contact portion of the plate fixing member 15.
  • the eccentric cam 165 is configured so that the rotating shaft 164 is provided at a position eccentrically-located from the center and the position of the upper end varies according to the rotation of the rotating shaft 164, which contributes to the movement operation of the plate fixing member 15 in the radially inward and outward directions of the plate cylinder 1.
  • the plate fixing member 15 is set so that the outer peripheral surface (plate contact surface 152) can move within the range inner than the inner surface of the printing plate 2 mounted on the plate mounting surface 111 along with the rotating operation of the rotating shaft 164 and can be fixed at a predetermined position within the range.
  • the plate fixing member 15 is configured in a manner as to be movable radially outward of the plate cylinder 1 inside the plate cylinder 1.
  • the circumferential length of the inner peripheral surface of the printing plate 2 is set to be slightly larger than the total circumferential length of the plate mounting surface 111 and the flat portion 13 and slightly smaller than the circumferential length of the cylindrical surface formed by the plate mounting surface 111 of the plate cylinder 1. This facilitates the insertion of the printing plate 2 with respect to the plate cylinder 1 and can avoid the situation in which the part of the printing plate 2 pressed by the plate fixing member 15 protrudes radially outward of the other part of the printing plate 2.
  • the plate fixing member 15 is configured such that its outer peripheral surface is movable within the range inner than the inner surface of the printing plate 2 mounted on the plate mounting surface 111. Therefore, the possibility of deformation of the printing plate 2 due to the pushing of the printing plate 2 by the plate fixing member 15 outer than the inner surface of the printing plate 2 mounted on the plate mounting surface 111 can be eliminated.
  • the plate fixing member 15 is configured so as to be fixed at an arbitrary position within the range inner than the inner surface of the printing plate 2 mounted on the plate mounting surface 111. Therefore, the fixing position of the plate fixing member 15 can be adjusted, so that detaching and attaching the printing plate 2 can be performed in a state in which the plate fixing member 15 is fixed at an arbitrary position.
  • air ejection holes 18 are formed at a plurality of locations on the outer peripheral surface on the tip end side.
  • the air ejection hole 18, in this example, is formed to have a diameter of 1.2 mm, and a total of six air ejection holes 18 is equally arranged in the circumferential direction on the tip end portion side of the plate cylinder 1.
  • Each air ejection hole 18 is configured such that air supplied from an air supply means not illustrated and provided inside the plate cylinder 1 is ejected toward the outside.
  • the air to be ejected from the air ejection hole 18 is ejected from the air ejection hole 18 at an air pressure of 392266 Pa to 490333 Pa ( 4 kgf/cm 2 to 5 kgf/cm 2 ), and supplied and stopped by opening and closing the valve of the air supply means manually at the time of attaching and detaching the printing plate 2.
  • the air layer formed between the plate cylinder 1 and the printing plate 2 can not become uniform, making it difficult to attach and detach the printing plate 2, and therefore it is not preferable. If the number of air ejection holes 18 is excessive, processing becomes complicated, resulting in a high cost, and therefore it is not preferable.
  • the air ejection hole 18 is provided according to the invention at a position away from the tip end portion by 20 mm to 50 mm, and more preferably provided at a position away from the front edge portion by 30 mm to 40 mm.
  • the size and shape of the air ejection hole 18 are set such that air is uniformly ejected between the plate cylinder 1 and the printing plate 2 and an air layer is uniformly formed.
  • a plurality of air ejection holes 18 is provided in the circumferential direction on the tip end side of the plate cylinder main body 11, a plurality of air ejection holes 18 is performed on the tip end side of the plate cylinder main body 11 which is an insertion side of the printing plate 2. Accordingly, when attaching and detaching the printing plate 2, the air ejected from a plurality of portions facilitates the slippage of the printing plate to be inserted or removed, resulting an easy attaching and detaching operation of the printing plate 2.
  • the procedure for attaching and detaching the printing plate 2 to and from the plate cylinder 1 is as follows.
  • the valve of the air supply means Before mounting the cylindrically formed printing plate 2 on the plate cylinder 1 from the tip end side of the plate cylinder 1, the valve of the air supply means is opened. As a result, from the air ejection holes provided on the tip end side of the plate cylinder 1, air will be ejected at a pressure of, for example, 392266 Pa to 490333 Pa (4 kgf/cm 2 to 5 kgf/ cm 2 ).
  • the printing plate 2 is inserted from the tip end side of the plate cylinder 1.
  • the attaching and detaching operation of the printing plate 2 can be easily performed.
  • the air layer is uniformly formed between the plate cylinder 1 and the printing plate 2.
  • the valve of the air supply means is closed to stop the supply of air.
  • the valve of the air supply means is opened so that the air is ejected from the air ejection holes 18.
  • the valve of the air supply means is closed to stop supplying air.
  • the hole portion 14 is described as a hole penetrating the flat portion 13, but the invention is not limited to this.
  • the hole portion 14 may be a portion in which a recess not penetrating the flat portion 13 is formed as long as at least the plate fixing member 15 can move radially inwards and outwards in the hole portion 14.
  • the printing plate 2 When attaching and detaching the printing plate 2 to and from the plate cylinder 1 as described above, according to the method of attaching and detaching the printing plate 2 while ejecting air from the air ejection holes 18, the printing plate 2 can be easily attached and detached by the air ejected from the air ejection holes 18 and interposed between the outer peripheral surface of the plate cylinder 1 and the inner peripheral surface of the printing plate 2.
  • the plate cylinder 1 attached to a rotationally driven plate driving shaft 100 and configured to mount a cylindrical printing plate 2 from a tip end side includes a plate cylinder main body 11 having a plate mounting surface 111 on which the printing plate 2 is to be mounted, a flat portion 13 formed into a flat surface positioned radially inward of the plate mounting surface 111, a plurality of hole portions 14 formed in the flat portion 13 side by side in an axially separated state, and a plurality of plate fixing members 15 configured to closely fix the printing plate 2 to the plate mounting surface 111.
  • the plate fixing member 15 is fitted in the hole portion 14 so as to be movable radially inward and outward of the plate cylinder 1. Therefore, with the configuration in which the plurality of hole portions 14 is arranged separated, a connection portion is provided between the adjacent hole portions 14, which can enhance the strength of the flat portion 13 of the plate cylinder 1 and can easily fix the printing plate 2 to the plate mounting surface 111.
  • the present invention can be used as a plate cylinder for mounting a printing plate for printing a metallic can.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP16768263.2A 2015-03-24 2016-02-23 Plate cylinder and method of attaching and detaching a printing plate Active EP3275656B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015060594A JP6514537B2 (ja) 2015-03-24 2015-03-24 版胴
PCT/JP2016/055197 WO2016152360A1 (ja) 2015-03-24 2016-02-23 版胴

Publications (3)

Publication Number Publication Date
EP3275656A1 EP3275656A1 (en) 2018-01-31
EP3275656A4 EP3275656A4 (en) 2018-09-05
EP3275656B1 true EP3275656B1 (en) 2020-04-08

Family

ID=56978322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16768263.2A Active EP3275656B1 (en) 2015-03-24 2016-02-23 Plate cylinder and method of attaching and detaching a printing plate

Country Status (6)

Country Link
US (1) US10688777B2 (enrdf_load_stackoverflow)
EP (1) EP3275656B1 (enrdf_load_stackoverflow)
JP (1) JP6514537B2 (enrdf_load_stackoverflow)
KR (1) KR102378285B1 (enrdf_load_stackoverflow)
CN (1) CN107206780B (enrdf_load_stackoverflow)
WO (1) WO2016152360A1 (enrdf_load_stackoverflow)

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JP6316121B2 (ja) * 2014-06-30 2018-04-25 昭和アルミニウム缶株式会社 版胴、版装着装置
JP6878935B2 (ja) * 2017-02-10 2021-06-02 東洋製罐株式会社 印刷版ユニット及びこれを用いた印刷装置
CN108081751A (zh) * 2017-12-08 2018-05-29 广州市佳盛印刷有限公司 一种烟草包装盒印刷装置的安装结构
CN108705862B (zh) * 2018-07-31 2023-12-19 贵州贤俊龙彩印有限公司 一种新型印版滚筒
EP3640031A1 (de) * 2018-10-17 2020-04-22 Flint Group Germany GmbH Zylinder mit beweglichem pin sowie montage- und demontageverfahren
JP7206145B2 (ja) * 2019-03-28 2023-01-17 アルテミラ製缶株式会社 スリーブ印刷版用版胴、スリーブ印刷版の固定方法、及び、缶の印刷装置
JP7206144B2 (ja) * 2019-03-28 2023-01-17 アルテミラ製缶株式会社 スリーブ印刷版用版胴、スリーブ印刷版の固定方法、及び、缶の印刷装置
CN110202917B (zh) * 2019-07-12 2021-01-15 佛山市南海区里水京阳胶辊制造有限公司 一种印刷机辊
CN116945749B (zh) * 2023-06-20 2025-06-27 浙江衢州盛元文创印业有限公司 一种凹版印刷机书刊套印系统
CN117283972B (zh) * 2023-11-20 2024-02-27 广东华盛铭兔环保科技股份有限公司 一种曲面印刷机的印版机构
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Also Published As

Publication number Publication date
WO2016152360A1 (ja) 2016-09-29
CN107206780B (zh) 2019-08-02
EP3275656A4 (en) 2018-09-05
JP6514537B2 (ja) 2019-05-15
CN107206780A (zh) 2017-09-26
EP3275656A1 (en) 2018-01-31
KR102378285B1 (ko) 2022-03-24
KR20170129100A (ko) 2017-11-24
US10688777B2 (en) 2020-06-23
JP2016179587A (ja) 2016-10-13
US20180037021A1 (en) 2018-02-08

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